Hi Guys,

The 1200/1400 turbine nut torque should be 100-105 lb-in, (11.3nm-11.9nm), use a small amount of oil on the thread and face of the nut to aid in correct torque reading. I use a pair of specially made clamp tools in a vice to hold the shaft during the torque procedure. The torque on the turbine nut is very important, too little and the consequences are obvious, too much and the shaft will be too highly stressed and "may" fail at high rpm/temp situations.

The compressor/impeller nut torque should be 85-90lb-in, (9.6nm-10.2nm). Be sure to put a "very small" amount of thread locker on the impeller nut threads to help prevent it working loose over time, just for a little bit of insurance....also a small amount of oil on the face of the nut to help prevent the aluminium fretting during the torquing process. It's highly unlikely it will come loose... but anything is possible.

If possible, be sure to use a "T" bar and socket rather than wrenches/spanners, this will prevent any possibility of the shaft flexing/bending in an undesireable manner causing undue stress on the shaft.

Xairflyer is correct in saying the compressor nut should have slightly less torque than the turbine nut, makes it easier during dis-assembly, it's a pain in the backside when the turbine nut comes undone first during teardown.

Cheers,
Smithy.